Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-28
Astronomy and Astrophysics
Astrophysics
6 pages, 4 figures. To appear in the ASP proceedings of IAU Symposium 217, "Recycling intergalactic and interstellar matter",
Scientific paper
Recent, high sensitivity, HI observations of nearby spiral galaxies show that their thin `cold' disks are surrounded by thick layers (halos) of neutral gas with anomalous kinematics. We present results for three galaxies viewed at different inclination angles: NGC891 (edge-on), NGC2403 (i=60 deg), and NGC6946 (almost face-on). These studies show the presence of halo gas up to distances of 10-15 kpc from the plane. Such gas has a mean rotation 25-50 km/s lower than that of the gas in the plane, and some complexes are detected at very high velocities, up to 200-300 km/s. The nature and origin of this halo gas are poorly understood. It can either be the result of a galactic fountain or of accretion from the intergalactic medium. It is probably the analogous of some of the High Velocity Clouds (HVCs) of the Milky Way.
Boomsma Rense
Fraternali Filippo
Oosterloo Tom
Sancisi Renzo
Swaters Rob
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